SourceBuffer.appendWindowStart
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
Draft
This page is not complete.
The appendWindowStart
property of the SourceBuffer
interface controls the timestamp for the start of the append window, a timestamp range that can be used to filter what media data is appended to the SourceBuffer
. Coded media frames with timestamps wthin this range will be appended, whereas those outside the range will be filtered out.
The default value of appendWindowStart
is the presentation start time, which is the beginning time of the playable media.
Syntax
var myAppendWindowStart = sourceBuffer.appendWindowStart; sourceBuffer.appendWindowStart = 2.0;
Value
A double, indicating the start time of the append window, in seconds.
Errors
The following errors may be thrown when setting a new value for this property.
Error | Explanation |
---|---|
InvalidAccessError |
An attempt was made to set the value to less than 0, or a value greater than or equal to SourceBuffer.appendWindowEnd . |
InvalidStateError |
One or more of the SourceBuffer objects in MediaSource.sourceBuffers are being updated (i.e. their SourceBuffer.updating property is currently true ), or this SourceBuffer has been removed from the MediaSource . |
Example
TBD
Specifications
Specification | Status | Comment |
---|---|---|
Media Source Extensions The definition of 'appendWindowStart' in that specification. |
Candidate Recommendation | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 23 | 25.0 (25.0)[1] 42.0 (42.0) |
11[2] | 15 | 8 |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | 4.4.4 |
Not supported |
Not supported | 11 | 30 | Not supported |
[1] Available after switching the about:config
preference media.mediasource.enabled
to true
. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.
[2] Only works on Windows 8+.
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/sourcebuffer/appendwindowstart